Accession Number : AD0782957

Title :   Shear Stress Distributions in Composite Models with Flaws.

Descriptive Note : Final rept. Apr 72-Sep 73,


Personal Author(s) : Peters,Walter H. , III ; Ranson,William F. , III ; Swinson,Weldon F. ; Tucker,Richard

Report Date : JUN 1974

Pagination or Media Count : 106

Abstract : Part I. Data is presented to note the effect of a flaw in a composite material structure. The flaws introduced were un-bonded fibers and broken fibers. The models were made of glass fibers and in epoxy matrix. Shear stress data around the flaw regions were extracted using scattered light photoelasticity. The fibers were biased at 90^, 75^, and 45^. The effect on the stress distribution of an unbonded fiber model was much more pronounced than with a broken fiber and would effect design procedures. Part II. The speckle reference beam technique has been shown to be a dependable method of uniquely obtaining two components of displacement. The technique can be used in real time work and application in the area of composite model work, in dynamic work and in nonlinear work. (Author-PL)

Descriptors :   *Fiber reinforced composites, *Shear stresses, Defects(Materials), Epoxy resins, Test methods, Measurement, Photoelasticity, Surface properties, Deformation, Temperature, Light scattering

Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE